冬季广州大气能见度影响因子分析

于2005年12月至2006年2月收集了华南所大气观测站大气能见度等7个气象因子及PM2.5浓度观测数据,分析了冬季广州大气能见度变化趋势及灰霾天气主要影响因子,并对能见度与主要影响因子进行相关性分析。结果发现:人为因素和气象条件对大气能见度的影响比较明显,当大气层结受到北方冷空气扰动后,能见度得到明显改善;1月份灰霾天气出现频率高达60.9%,灰霾天气下大气能见度与PM2.5浓度密切相关;大气能见度与PM2.5浓度、温度、相对湿度呈负相关性,与大气压呈正相关性;灰霾天气下大气能见度还与细颗粒物的粒径分布密切相关。

Analysis on Variation Trends of Atmospheric Visibility and Its Effect Factors in Winter in Guangzhou

Data of atmospheric visibility and other six meteorological factors and PM_(2.5)(aerodynamic diameter less than(2.5) microns) concentration were collected from December 2005 to February 2006 in air monitoring site in South China Institute of Environmental Science.Through analyzing variation trends of atmospheric visibility and the principal effect factors of hazes,as well as the relation of the visibility with meteorological factors and PM_(2.5) concentration, the obtained results were as follows:the effect of anthropogenic activity and weather for atmospheric visibility was obvious.When atmospheric stabilization was disturbed by cold air mass from north,the visibility became better.The hazes occured in high frequency in January,the frequency equaled to 60.9%.There was close relation of visibility with PM_(2.5) concentration in the haze weather.The correlations of visibility with PM_(2.5) concentration,temperature and relative humidity were negative,but the correlation between visibility and atmospheric pressure were positive.There was also close correlation between visibility and the aerodynamic diameter distribution of fine particulate mater.